Yoga Sutras 3.38
Patanjali, explained by Swami Vivekananda
ते समाधावुपसर्गा व्युत्थाने सिद्धयः ॥
te samādhāvupasargā vyutthāne siddhayaḥ
These are obstacles to Samadhi; but they are powers in the worldly state.
In plain words: These special powers look impressive in ordinary life, but they get in the way of Samadhi, the deepest stillness. If the yogi gets attracted to them, his progress stops. If he lets them go, he reaches the highest goal.
Swami Vivekananda explains
To the Yogi knowledge of the enjoyments of the world comes by the junction of the Purusha and the mind. If he wants to make Samyama on the knowledge that they are two different things, nature and soul, he gets knowledge of the Purusha. From that arises discrimination. When he has got that discrimination, he gets the Pratibha, the light of supreme genius. These powers, however, are obstructions to the attainment of the highest goal, the knowledge of the pure Self, and freedom. These are, as it were, to be met in the way; and if the Yogi rejects them, he attains the highest. If he is tempted to acquire these, his further progress is barred.